Electric heater unit.



. L v'. LEONARD.

ELECTRIC HEATER UNH.

APPLICATION FILED BECA). 1917- 1 ,278,484 Faeme Sept. 1G, M8,

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mater tubes Sp ures are "he mini minals is itted on a minals 1617 which latter is connected 1with the negative lead.' The tubes 6, 5, 4 with their terminals l5), 18 are similarly connected to terminals ll and 17.

The clips 13 of adjacent tubes are clamped on the terminals by means of the nuts 30 and in order to remore a tube it is only necessary to slacken the nuts of the terminals on either side of the particular defective tube when the latter may be withdrawn from its socket in the base.

A cover 22 Fig. 5 which protects the terstud 23 projecting up from the center of the base and is secured by a nut 2e.

A suitable number of holes 25 formed in said cover allow a free passage of air through the tubes which air becomes heated by contact with the het internal surface of the tubes.

Various types of switches may be used for cutting out any desired number of tubes and so regulating,- the heat energy. ln the illustration ,given there are two series, viz.- tubes l, 2, and l, 5, G, and one or other of the series may be cut out by introducing a switch in place of one of the intermediate terminals.

A tumbler switch may be used for the pur pose as illustrated in Fig. 6 and in this case female contacts 2G are used in lieu of thel slotted clips 13 and the male contacts 27 are` operated by the tumbler :28 to make or break contact and thus employ the full heat energy or only balic of same.

l. n improved electric heat unit consisting ota series oi heat resisting tubes extending radially from a central insulating base the ends ot which tubes are approximately parallel to the axial line of said base, said tubes being formed exteriorly With spiral grooves in which are embedded high vresistance Wires.

2. An electric heat unit as set forth in claim l and in which the tubes are set at an inclination and their ends are splayed so as to be approximately parallel to the axial line of the unit.

3. An electric heat unit as set forth in claim l and in which the ends of the radially arranged tubes are turned so thattheir apertures are approximately parallel to the axial linev of the unit.

An electric heat unit as set forth in claim l and in whichy the tubes are independently seated in inclined sockets formed in the base and detachably clipped to terminal studs thereon.

5. An electric heat unit as set 'fort-h in claim l and in which the tubes are independently attached to the base by clip means constituting conductors in the circuit.

6. An electric heat unit as set forth in claim et and in which the tubes are provided with slotted clips Which engage the terminal studs and are secured by clamping nuts on the latter said clips constituting conductors in the circuitl'. An electric heat unit as set forth in claim 5 and in which each tube is provided With a clip on each side one being connected with an internal contact strip to which one end of the resistance wire is attached.

8. n electric heating unit as set forth in claim 5, in which the slotted clips on one pair of adjacent tubes are replaced by contact studs and a movable switch member is ijirovided for coperating with said .contact studs for regulating theheat energy, substantially as described.

9. An electric heat unit as set fort-h in claim l and in which the tubes are clipped to terminal studs and the base is provided with a central stud upon which is secured a cover 85 to protect the terminal studs.

LESLIE VCTOR LEONARD. 

